Characterization and high piezoelectric performance of Pb(Fe1/2Nb1/2)O3-Pb(In1/2Nb1/2)O3-PbTiO3 ternary ceramics

(0.93 - x)Pb(Fe1/2Nb1/2)O3-0.07Pb(In1/2Nb1/2)O3-xPbTiO3 (0.06 ≤ x ≤ 0.11) ternary system was synthesized using B-site precursor solid-state reaction method. The maximum piezoelectric coefficient d33 = 673 pC/N was achieved at the morphotropic phase boundary (MPB) composition x = 0.09 and its Curie temperature is 141 °C. In-situ high energy synchrotron X-ray diffraction (SXRD) results demonstrate that tetragonal and monoclinic phases coexist at the MPB composition. It is interesting to observe that the stable single monoclinic phase induced by electric field presents a character of flexible lattice parameters responding to electric field. The large piezoelectric response of PFN-PIN-PT is found to be ascribed to the intrinsic lattice strain.